120020561 has 8 divisors (see below), whose sum is σ = 131180544. Its totient is φ = 109316160.

The previous prime is 120020519. The next prime is 120020597. The reversal of 120020561 is 165020021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120020561 - 2¹⁴ = 120004177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120020501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113345 + ... + 114398.

It is an arithmetic number, because the mean of its divisors is an integer number (16397568).

Almost surely, 2^120020561 is an apocalyptic number.

It is an amenable number.

120020561 is a deficient number, since it is larger than the sum of its proper divisors (11159983).

120020561 is a wasteful number, since it uses less digits than its factorization.

120020561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227791.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 120020561 is about 10955.3895868655. The cubic root of 120020561 is about 493.2705842498.

Adding to 120020561 its reverse (165020021), we get a palindrome (285040582).

The spelling of 120020561 in words is "one hundred twenty million, twenty thousand, five hundred sixty-one".